Demon Emperor in the Multiverse

Hailed as the Greatest Hero, Jay made a noble sacrifice and save many lives. Wang Shen thinks that he is a reincarnated person and believes that he was a genius in the past. With the vast arsenal of techniques and skill in his memories as the proof, what will Wang Shen do in this new life of his? *** First Fanfic. Not good with english so bear with my grammar. I will write as I go so there is no fixed plot, please feel free to suggest anything. Will be a multiverse travel but still thinking about it. The first world will be Super Gene.